This is a product that integrates the functions of codewatch, bicycle headlight and horn. It is compact and easy to install, bringing more convenience and safety to cycling. Specifications: Color: black, blue, red, green (optional) Lumen: 450lm Battery, 3.7V, 2000mAh Material: ABS Item size: 119 * 58 * 90mm / 4.7 * 2.3 * 3.5in Package size: 130 * 94 * 82mm / 3.7 * 3.2in Package weight: 311g / 11.0ounce Packing List: 1 * USB Cable 1 * Tie 1 * Button Cable 1 * Speed Meter 1 * Button Fixing Belt 2 * Antislip Gasket 1 * Sensor 1 * Magnet 2 * Bracket